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High blood sugar inhibits your HGH production, so you should avoid foods high in sugar generally, but especially before bed, if you want to avoid inhibiting your natural HGH production during sleep.
To increase GHRH:
Sleep 7.5-9 hours per night, with 6 hours as a bare minimum
Do short-term fasting by using the 16/8 “Leangains” schedule or the 24-hour “Eat Stop Eat” fast once or twice a week.
Do high intensity exercise regularly
Depending on your goals and the type of exercise, combine fasting and exercise to get a synergistic boost in GH
To minimize GHIH:
Minimize long-term stress through better planning, meditation, relaxing, and/or anything else that eliminates long-term stress
Stay relatively lean and don’t let yourself get fat (maximum 15-18% for guys, 24-27% for girls)